Rotor Earth-Fault Protection, Injection Method (Mrefptoc); High-Impedance Or Flux-Balance Based Differential Protection (Mhzpdif) - ABB REX640 Product Manual
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REX640
Product version: 1
Table 128. Rotor earth-fault protection, injection method (MREFPTOC)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy
Suppression of harmonics
1)
Current before fault = 0.0 × I
, f
= 50 Hz, earth-fault current with nominal frequency injected from random phase angle, results based on statistical distribution of 1000 measurements
n
n
2)
Includes the delay of the signal output contact
Table 129. Rotor earth-fault protection, injection method (MREFPTOC) main settings
Parameter
Operate start value
Alarm start value
Operate delay time
Alarm delay time
Table 130. High-impedance or flux-balance based differential protection (MHZPDIF)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Measurement mode = "Peak-to-Peak", current before fault = 0.0 × I
1)
distribution of 1000 measurements
2)
Includes the delay of the signal output contact
Table 131. High-impedance or flux-balance based differential protection (MHZPDIF) main settings
Parameter
Operate value
Minimum operate time
70
Start value
I
= 1.2 × set
Fault
Function
MREFPTOC
MREFPTOC
MREFPTOC
MREFPTOC
Start Value (one
I
= 2.0 × set
Fault
phase fault)
Start Value (three
I
= 2.0 × set
Fault
phases fault)
, f
= 50 Hz, fault current with nominal frequency injected from random phase angle, results based on statistical
n
n
Function
MHZPDIF
MHZPDIF
Value
Depending on the frequency of the current measured: f
±1.5% of the set value or ±0.002 × I
Minimum
Typical
30 ms
34 ms
<50 ms
Typically 0.96
<50 ms
±1.0% of the set value of ±20 ms
-50 dB at f = n × f
, where n = 2, 3, 4, 5,...
n
Value (Range)
0.010...2.000 × I
n
0.010...2.000 × I
n
40...20000 ms
40...200000 ms
Value
Depending on the frequency of the measured current: f
±1.5% of the set value or 0.002 × I
Minimum
Typical
13 ms
17 ms
11 ms
14 ms
<40 ms
Typically 0.96
<35 ms
±1.0% of the set value of ±20 ms
Value (Range)
0.5...50.0 %I
n
20...300000 ms
1MRS759144 A
±2 Hz
n
n
Maximum
38 ms
Step
0.001
0.001
1
1
±2 Hz
n
n
Maximum
21 ms
17 ms
Step
0.1
10
ABB
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